add_paracert2DB(): return 0 on success, not 1
add_paracert2DB(): return 0 on success, not 1

None of the callers care what the success return value is just as long
as it's non-negative, so use the standard value that means no error.

rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir